Cura ironing blob at finish point

[VoxelMonoprice]

Hello and Happy New Year everybody.

I’m using Cura and ironing which is giving a great surface finish except for the finishing corner where the pla is forming a slight lump which appears to be more shiny than the rest of the surface.

Anyone have any suggestions to help me achieve a uniform ironed surface?

Printer is a Voxel Monoprice.

Cura ironing blob

Thank you.

[Roberts_Clif]

When using your slicer you can enter Start and End G-Code.

You will note is the G-Code Below

Code: Select all

M104 S0                     ;extruder heater off
M140 S0                     ;heated bed heater off (if you have it)
G91                             ;relative mode
G1 Z+0.5 E-2 F{travel_speed}    ;raise Z above print
G90                             ;absolute mode
G1 X0 Y270                      ;move extruder to rear left Model to front.
M84                         ;steppers off
G90                         ;absolute positioning

Note
M104 turns off Extruder
M140 turns of Hot-Bed
G1 X0 Y270 moves the Hot-end to the rear left corner of hotbed moving it off the model
M84 turns off the Steppers motors
I have a build area of 220mm x 270mm x 200mm

Hope this helps

[VoxelMonoprice]

Thank you Sir.

I did add a similar piece of end G-Code which moves the nozzle away from the model as soon as the print completes.

Looking at the model, it does appear that the nozzle converging on the corner would likely concentrate the heat in that area causing the shine and blister.

I took a closer look at the G-Code to see if I might speed up the nozzle towards the end, maybe I could even reduce the temperature but I’m not sure if the printer would wait until the nozzle cooled before proceeding thereby spoiling the ironing in a different manner. Anyhow, this route would doubtless be steeped in trial and error - good job I’m the most tenacious person I know

I’ll get back on it tomorrow!

[Roberts_Clif]

I understand tenacious.
I fought with myself for weeks when deciding to upgrade and flash a new firmware to my 3D Printer.
Before attempting the flash I looked forever to find the firmware that sounded best 'source code' too flash, examined it line by line until satisfied.
So to make a long story short purchased a backup controller, flashed my new firmware then replaced the controller to test the new firmware.

By the way
I still flash to a test controller, I make a test environment to simulate a 3D Printer for the test flash.
Then test all functions before flashing to a 3D Printer....

[LePaul]

Oooh that's a ugly burn / melt spot. I'm betting Clif's suggestion fixes you